Transition radiation of the neutrino toroid dipole moment

We discuss the transition radiation of a neutrino induced by its toroid dipole moment (τ) when crossing the interface between two different media with different refraction indices. A neutrino of 1 MeV energy emits approximately 10−40 keV at τ=e2GF/π2. This effect depends very slightly on the neutrino mass and has a finite value in the massless limit.